Recognize IGNORE/INCLUDE parameter entities.
Recognize IGNORE/INCLUDE parameter entities.

Handle external parameter entities.

Fix bug with attribute groups.

dmj/jing-trang,dmj/jing-trang,dmj/jing-trang,brand/jing-trang,brand/jing-trang,hanshuebner/jing-trang,brand/jing-trang,hanshuebner/jing-trang,hanshuebner/jing-trang